I am working on a Cobra Derringer .22lr. The firing pins are long (.124 on top and .113 on the bottom, max and absolute protrusion) and have dinged both chambers. The firing pins are also offset (you can’t just chuck it up in a drill and put the hemisphere on it). I also do not have a four jaw lathe chuck to put it in either. Any ideas or simple fixtures that might work?
Vice and files and sand paper then buffer. Remember on a rimfire it doesn’t have to be hemispherical. Ken
Answer
Don’t fire rimfires if absolute protrusion exceeds .035”. Get a Menck rimfire chamber swage from Brownells to remove dings, or make your own. Jack
